MTU 12 V 4000 L62FB Operating Instructions Manual page 108

435 – SS T-Coolant Before Engine
Red alarm. Engine shutdown.
Associated parameter 2.0173.932
Cause
Coolant temperature before
engine too high (limit value 2).
Engine coolant pump failure, flow
too low, air in engine cooling
system.
443 – HI P-Charge Mix Diff.
Yellow alarm.
Associated parameter 2.0183.931
Cause
Difference in mixture pressures
sensed on A and B side is too high
(limit value 1).
447 – HIHI P-Charge Mix Diff.
Red alarm. Engine shutdown.
Associated parameter 2.0183.932
Cause
Difference in mixture pressures
sensed on A and B side is too high
(limit value 2).
451 – HI T-Charge Mix
Yellow alarm.
Associated parameter 2.0169.931
Cause
Mixture temperature is too high
(limit value 1). Mixture coolant
pump failure, volumetric flow too
low, cooling system inlet
temperature too high, mixture
cooler clogged.
108 | Troubleshooting | MS150098/02E 2016-11
Corrective action
u Check engine coolant circuit (pressure and flow).
Corrective action
1. Check throttles for varying positions and malfunction.
2. Check mixture lines for leakage.
3. Check sensors and cabling (B79.22, B79.21).
Corrective action
1. Check throttles for varying positions and malfunction.
2. Check mixture lines for leakage.
3. Check sensors and cabling (B79.22, B79.21).
Corrective action
1. Check mixture cooling circuit.
2. Check mixture cooler for dirt.